PD雷达主动导引头数字中频接收机的设计与实现

The Design and Implementation of the Digital IF Receiver for a PD Radar Seeker

PD雷达主动导引头具有很强的杂波抑制能力 ,广泛应用于对超低空飞行器的探测与跟踪。某PD雷达导引头采用模拟中频接收机 ,参数温漂大、电路线性差 ,调试过程复杂 ,导引头测量精度难以提高 ,产品一致性、可靠性和可生产性较差 ,难以满足未来精确制导武器的战术指标要求。提出了数字中频接收机的设计思想和方案 ,并加以实现。测试结果表明 ,数字中频接收机可以有效克服模拟接收机的固有缺点 ,提高导引头测量精度 ,减小体积和功耗 ,提高产品的一致性、可靠性和可生产性。另外 ,数字中频接收技术可在不改变硬件的情况下 ,通过软件对接收机参数进行重新配置。

Because of its strong ability of clutter rejection, the PD radar seeker has been used widely in superlow-altitude operation against aircraft targets. As for the analog IF receiver used in an active PD radar seeker, due to its inherent disadvantages listed below: a) parameters varying with temperature offset; b) poor linearity of circuits and c) complicated procedure to experiment and adjust the circuits, it's hard to improve the seeker's measuring precision further. The poor consistency, reliability and productibility of the product make it difficult to satisfy the requirements of the future precise guidance weapon. In this paper, a digital IF receiver scheme and its implementation are presented. The results of the experiment indicate that with the digital receiver used in the seeker, the inherent disadvantages of the analog receiver do not exist any more, the seeker's measuring precision is improved markedly, the outline size and power consumption are decreased, and the consistency, reliability and productibility of the product are guaranteed. Another advantage of the digital receiver is that the receiver's parameters can be re-configurated by the software without changing the hardware, which makes it possible to re-define the seeker rapidly.